The investigation was carried out to evaluate the effects of two stocking rates (CA280= 280 kg LW/ha and CA=360= 360 kg LW/ha) and two weaning ages of calves (DC = Conventional weaning at seven months of age and DP= Early weaning at three/four months of age) on reproductive performance of primiparous beef cows of two breed compositions (½ Nelore ½ Hereford and ¼ Nelore ¾ Hereford). Average daily weight gain (GMD) from calving to DC, during the mating period, and […]

This study was carried out to analyse the skin of three species of fish (piavuçu Leporinus macrocephalus, pacu prata Mylossoma sp e piraputanga Brycon hilarii) through histological and morphometrical analysis and resistance tests after hardening. Skin samples from the dorsal region were taken and fixed in Bouin solution for 24 hours. They were embedded in paraffin, cut 5 µm thick and stained by Hematoxylin-eosin technique. The cuts were analyzed by light microscopy. A EMIC dynamometer was used for the physical […]

The objective of this work was to determine the fractions and rates of degradation of the carbohydrates for sugar cane, with different cycles of production (early and intermediate), in three cut times (426, 487 and 549 days). The total carbohydrates (TC), non-fibrous carbohydrates (NFC), fractions potentially digestible (B2) and indigestible (C) of the neutral detergent fiber (NDF), corrected for ashes and protein (NDFcp), were obtained. The kinetic parameters of NFC and fraction B2 were obtained from the technique of in […]

Variation in the abundance of 13C and biological nitrogen fixation in legume plants such as alfalfa (Medicago sativa L.) can be used in cultivar selection programs allowing a better understanding of the physiological processes related to water use, photosynthesis and biological nitrogen fixation and their interdependence. This would supply data for selection programs for the improvement of dry matter yield (DM), water use efficiency (WUE) and biomass quality. Thus evaluation of the plant under contrasting conditions becomes necessary, therefore in […]

This work was carried out to study the daily average gain (DAG) of steers grazing Brachiaria brizantha cv. Marandu, supplemented, from July to December, with two levels of three different supplements. Fifty-four Nellore steers (9 for each treatment) aged approximately 20 months and initial average live weight of 370 kg were used. The experimental treatments were: AMI – supplement rich in starch (based on corn), OLE – supplement rich in fat (based on whole cottonseed) and A+O – supplement combination […]

The objective of this study was to estimate heritabilities, genetic correlations, genetic trends and rank correlations of the bulls, for weights at 8, 12, 18 and 24 months of age, in the Guzerat herd from UNESP Campus, Ilha Solteira, SP. The heritabilities and the breeding values were estimated by animal model, using the MTDFREML computational program. The genetic correlations (Pearson) and the rank correlations (Spearman) were obtained by SAS CORR procedure, using the animal breeding values, while the genetic trends […]

The objective of this study was to evaluate the effects of feeding alfalfa haylage with microbial inoculat on dry matter intake, milk yield and composition in Holstein cows, at 135 ± 16.4 days in milk. A cross-over design with two periods of sampling was used. Treatments were alfalfa haylage (50.0% DM and 16.5% CP) control or microbially inoculated with Silobac® product (Lactobacillus plantarum and Pediococcus pentosaceus). Each experimental period extended for twenty-one days, the last five used for data collection. […]

The objetive of this work was to evaluate the effect of environmental factors on the shape of lactation curves (Quadratic, Gama, Linear Hiperbolic and Jenkins & Ferrel) of Saanen, Alpine and Toggenburg as well as mixed breed goats. Data from 299 lactations of 215 goats raised on two farms in the Federal District from 1995 to 1997 was used. The parameters of the lactation curves (yield at start of lactation- a, rate of increase of milk production – b e […]

Two assays were performed to evaluate the apparent digestibility of nutrients in horses diets, using the total collection of feces method and the markers chromic oxide, indigestible acid detergent fiber (iADF), indigestible neutral detergent fiber (iNDF), indigestible cellulose (iCEL), lignin (LIG), and insoluble acid detergent ashes (ADTA), as markers. In the first assay, five crossbred colts were used, fed five diets with different levels of crude protein, maintaining the relationship 50:50 concentrate to forage. The chromic oxide was used as […]

The trial aimed to observe the ingestive behavior of grazing beef steers submitted to different energetic supplementation levels and kept under an improved natural pasture. Thirty eight beef steers without definite breed, aging 12 to 15 months and weighing 159,97 kg were used. Animals were kept under set stocking in a natural pasture improved with Lotus Subbiflorus and invaded with Eragrostis plana Ness. Two levels of ground sorghum grain were offered as an energetic supplement, and treatments consisted of control […]